<?php

/**
 * UserIdentity represents the data needed to identity a user.
 * It contains the authentication method that checks if the provided
 * data can identity the user.
 */
class UserIdentity extends CUserIdentity
{
	/**
	 * Authenticates a user.
	 * The example implementation makes sure if the username and password
	 * are both 'demo'.
	 * In practical applications, this should be changed to authenticate
	 * against some persistent user identity storage (e.g. database).
	 * @return boolean whether authentication succeeds.
	 */
	public function authenticate()
	{
			$users=array(
                        	'guest'=>'password',
                        	'demo'=>'demo',
                        	'admin'=>'admin'
                	);
                	
			if(!isset($users[$this->username])) {
                        	$this->errorCode=self::ERROR_USERNAME_INVALID;
                	} else if($users[$this->username]!==$this->password) {
                        	$this->errorCode=self::ERROR_PASSWORD_INVALID;
                	} else {
                        $this->errorCode=self::ERROR_NONE;
                        $this->setState('password', $this->password);
                	}
    	return !$this->errorCode;
	}
}
